On the other hand, they've got another two systems they can pretty much ignore.
3DS got far too little time last year, and I'm worried that'll happen again. With only 60 minutes, I think the only split that works is this:
10 Wii+DS+filler
20 3DS
30 Wii U
But that's only barely enough time to show everything they need to show for Wii U, since I would expect that they're going to announce a shitton of games and have a few on-stage demos. Wii U should have 40 minutes ideally.
Of course, Nintendo could fix this issue by killing that damn NDA. >_>; Maybe we'll get lucky and it ends up taking an extra 10-15 minutes.